Returns the last value inserted into an IDENTITY column or a DEFAULT AUTOINCREMENT column, or zero if the most recent insert
was into a table that did not contain an IDENTITY or DEFAULT AUTOINCREMENT column.
The ID generated for an IDENTITY column or a DEFAULT AUTOINCREMENT column by a previous INSERT statement, or zero if the last
insert did not affect an IDENTITY or DEFAULT AUTOINCREMENT column. The function can return FALSE (0) if $stmt is not valid.